Design and operation of Kamaz auxiliary brake devices

Auxiliary brake (sometimes referred to as an engine retarder) is used to reduce the load and temperature of the service brake brakes.

Schemes of connection and operation of devices in the auxiliary brake circuit

Fig. Fig. 2. Schemes of connection and operation of devices in the auxiliary brake circuit: a - during braking, b - during release; 1 - double protective valve, 2 - pneumatic valve, 3 - solenoid valve sensor, 4 - electric drive to the trailer solenoid valve, 5 - damper closing pneumatic cylinders, 6 - fuel supply deflection pneumatic cylinder; 1 - air supply from the condensation receiver, II - air outlet to the atmosphere

When the retarder is applied, the engine exhaust pipes are blocked and the fuel supply is turned off.

The auxiliary brake drive circuit and other consumers consists of a part of a double safety valve 1 (Fig. 1), a pneumatic valve 2, two pneumatic cylinders 5 and a pneumatic cylinder 6 of the stop lever drive, a pneumoelectric sensor 3, pipelines and hoses between these devices.

The air in the circuit comes from the condensation receiver and two circuits.

Kamaz auxiliary brake operation

From the auxiliary brake drive circuit, compressed air is supplied to additional (not the brake system) consumers: a pneumatic signal, a pneumohydraulic clutch booster, etc.

The device and operation of the protective valve 1 are discussed above.

Pneumatic cylinders 5 actuate the mechanisms of the engine retarder.